Vulnerability Description
SiYuan versions before v3.8.2 contain a path guard bypass vulnerability in the MCP file-access handler that uses case-sensitive matching on Linux filesystems. Attackers can read the protected publishAccess.json file by requesting case-variant paths like PublishAccess.json to disclose sensitive publish-access configuration and metadata.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mmgw-3mx9-cfwp
- https://www.vulncheck.com/advisories/siyuan-before-3.8.2-path-guard-bypass-via-c
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mmgw-3mx9-cfwp
FAQ
What is CVE-2026-85580?
CVE-2026-85580 is a vulnerability with a CVSS score of 6.5 (MEDIUM). SiYuan versions before v3.8.2 contain a path guard bypass vulnerability in the MCP file-access handler that uses case-sensitive matching on Linux filesystems. Attackers can read the protected publishA...
How severe is CVE-2026-85580?
CVE-2026-85580 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-85580?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.